[Gluster-devel] posix: symlink broken?

[Amar Tumballi]

On 10/11/2012 11:35 AM, M. Mohan Kumar wrote:
>
> As part of BD xlator symlink interface testing, I figured out that the
> parameter 'linkname' contains even the mount point for example
> '/media/link'. I wonder we should never get the mount directory in the
> server part of code.
>
> I tested creating symlink with posix xlator with top git commit
> 751da4675cf3add21e567aebb92de2c10457afee.
>
> Here is the steps I followed:
>
> [root at host mohan]# mount -t glusterfs host:/posix /media
>
> [root at host mohan]# ls -la /media/
> total 8
> drwx------.  3 root root 4096 Oct 11 11:15 .
> dr-xr-xr-x. 20 root root 4096 Sep 28 16:40 ..
>
> [root at host mohan]# touch /media/file
>
> [root at host mohan]# ln -s /media/file /media/link
>
> [root at host mohan]# ls -la /media/
> total 9
> drwx------.  3 root root 4096 Oct 11 11:18 .
> dr-xr-xr-x. 20 root root 4096 Sep 28 16:40 ..
> -rw-r--r--.  1 root root    0 Oct 11 11:18 file
> lrwxrwxrwx.  1 root root   11 Oct 11 11:18 link -> /media/file
>
> [root at host mohan]# umount /media
>
> [root at host mohan]# mount -t glusterfs host:/posix /media/posix
>
> [root at host mohan]# ls -la /media/posix/
> total 9
> drwx------. 3 root root 4096 Oct 11 11:18 .
> drwxr-xr-x. 4 root root 4096 Oct 11 07:55 ..
> -rw-r--r--. 1 root root    0 Oct 11 11:18 file
> lrwxrwxrwx. 1 root root   11 Oct 11 11:18 link -> /media/file
>
>
> Directory listing of brick from server side
> [root at host mohan]# ls -la ~/gl/posix/
> total 24
> drwx------.  3 root root 4096 Oct 11 11:18 .
> drwx------.  4 root root 4096 Sep 28 20:20 ..
> -rw-r--r--.  2 root root    0 Oct 11 11:18 file
> drw-------. 12 root root 4096 Oct 11 11:18 .glusterfs
> lrwxrwxrwx.  2 root root   11 Oct 11 11:18 link -> /media/file
>
>
> Ideally it should be link -> file instead of /media/file

It the same behavior on backend fs also... I don't see it as a problem 
in GlusterFS.

----snip----
[root at unused data]# mount fs1 /mnt/a/
[root at unused data]# df -h /mnt/a
Filesystem      Size  Used Avail Use% Mounted on
/dev/loop0      9.9G  151M  9.2G   2% /mnt/a
[root at unused data]# cd /mnt/a
[root at unused a]# echo hello > file
[root at unused a]# ln -s  /mnt/a/file abcd
[root at unused a]# ls -l
total 20
lrwxrwxrwx. 1 root root    11 Oct 11 12:05 abcd -> /mnt/a/file
-rw-r--r--. 1 root root     6 Oct 11 12:04 file
[root at unused a]# cd
[root at unused ~]# umount /mnt/a
[root at unused ~]# cd /data
[root at unused data]# mount fs1 /mnt/b
[root at unused data]# ls -l /mnt/b
total 20
lrwxrwxrwx. 1 root root    11 Oct 11 12:05 abcd -> /mnt/a/file
-rw-r--r--. 1 root root     6 Oct 11 12:04 file
[root at unused data]#

---- snip ----


>
> When I remounted with a different directory symlink is broken. Ideally
> it should not create symlink with client mount directory details or am I
> missing some thing here?
>